I'm looking into purchasing the Qmatic and am wondering what kind of setup will give me the highest top speed. My stock HS will get me up around 32-33 with a little shove to get going. Not great bottom end but I never have to peddle. I'm basically looking for the same thing from the Qmatic. A little shove to get going and higher top speed. I can't imagine that I'm the only one wondering about the speed gains possible from the adjustability and efficiency of the Qmatic. Does anyone have that type of info? Say with a 56t rear sprocket and 26x2.125 wheels/tires, what's the top speed a 175lb rider could get with a HS and minimal peddling (theoretical or real-world)? Also, I've read that the Qmatic should be paired with at least a 56t but can you go any lower? Would you get any real speed increases or would it be too hard on the gearbox? I've done some theoretical calculations with agk's calculator and it says I should be able to hit 56mph LOL! Needless to say, I neither have the know-how nor the information to compute what I'm looking for. Does anyone else?